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/*
* libwebsockets - small server side websockets and web server implementation
*
* Copyright (C) 2010 - 2021 Andy Green <andy@warmcat.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* After Public Domain implementations
*
* https://github.com/svaarala/duktape/tree/master/misc
*/
#include <private-lib-core.h>
static inline uint64_t rol64(uint64_t x, int k)
{
return (x << k) | (x >> (64 - k));
}
uint64_t
lws_xos(struct lws_xos *xos)
{
uint64_t *s = &xos->s[0];
uint64_t const result = rol64(s[1] * 5, 7) * 9;
uint64_t const c = s[1] << 17;
s[2] ^= s[0];
s[3] ^= s[1];
s[1] ^= s[2];
s[0] ^= s[3];
s[2] ^= c;
s[3] = rol64(s[3], 45);
return result;
}
static uint64_t
splitmix64(uint64_t *s)
{
uint64_t r = *s;
*s = r + 0x9E3779B97F4A7C15ull;
r = (r ^ (r >> 30)) * 0xBF58476D1CE4E5B9ull;
r = (r ^ (r >> 27)) * 0x94D049BB133111EBull;
return r ^ (r >> 31);
}
void
lws_xos_init(struct lws_xos *xos, uint64_t seed)
{
int n;
for (n = 0; n < 4; n++)
xos->s[n] = splitmix64(&seed);
}
int
lws_xos_percent(struct lws_xos *xos, int percent)
{
return (int)(lws_xos(xos) % 100) < percent;
}
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